<!doctype html>
<html>

<head>
	<title>Radar Chart</title>
	<script src="../../Chart.bundle.js"></script>
	<script src="../utils.js"></script>
	<style>
		canvas {
			-moz-user-select: none;
			-webkit-user-select: none;
			-ms-user-select: none;
		}
	</style>
</head>

<body>
	<div style="width:40%">
		<canvas id="canvas"></canvas>
	</div>
	<button id="randomizeData">Randomize Data</button>
	<button id="addDataset">Add Dataset</button>
	<button id="removeDataset">Remove Dataset</button>
	<button id="addData">Add Data</button>
	<button id="removeData">Remove Data</button>
	<script>
		var randomScalingFactor = function() {
			return Math.round(Math.random() * 100);
		};

		var color = Chart.helpers.color;
		var config = {
			type: 'radar',
			data: {
				labels: [['Eating', 'Dinner'], ['Drinking', 'Water'], 'Sleeping', ['Designing', 'Graphics'], 'Coding', 'Cycling', 'Running'],
				datasets: [{
					label: 'My First dataset',
					backgroundColor: color(window.chartColors.red).alpha(0.2).rgbString(),
					borderColor: window.chartColors.red,
					pointBackgroundColor: window.chartColors.red,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					]
				}, {
					label: 'My Second dataset',
					backgroundColor: color(window.chartColors.blue).alpha(0.2).rgbString(),
					borderColor: window.chartColors.blue,
					pointBackgroundColor: window.chartColors.blue,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					]
				}]
			},
			options: {
				legend: {
					position: 'top',
				},
				title: {
					display: true,
					text: 'Chart.js Radar Chart'
				},
				scale: {
					ticks: {
						beginAtZero: true
					}
				}
			}
		};

		window.onload = function() {
			window.myRadar = new Chart(document.getElementById('canvas'), config);
		};

		document.getElementById('randomizeData').addEventListener('click', function() {
			config.data.datasets.forEach(function(dataset) {
				dataset.data = dataset.data.map(function() {
					return randomScalingFactor();
				});
			});

			window.myRadar.update();
		});

		var colorNames = Object.keys(window.chartColors);
		document.getElementById('addDataset').addEventListener('click', function() {
			var colorName = colorNames[config.data.datasets.length % colorNames.length];
			var newColor = window.chartColors[colorName];

			var newDataset = {
				label: 'Dataset ' + config.data.datasets.length,
				borderColor: newColor,
				backgroundColor: color(newColor).alpha(0.2).rgbString(),
				pointBorderColor: newColor,
				data: [],
			};

			for (var index = 0; index < config.data.labels.length; ++index) {
				newDataset.data.push(randomScalingFactor());
			}

			config.data.datasets.push(newDataset);
			window.myRadar.update();
		});

		document.getElementById('addData').addEventListener('click', function() {
			if (config.data.datasets.length > 0) {
				config.data.labels.push('dataset #' + config.data.labels.length);

				config.data.datasets.forEach(function(dataset) {
					dataset.data.push(randomScalingFactor());
				});

				window.myRadar.update();
			}
		});

		document.getElementById('removeDataset').addEventListener('click', function() {
			config.data.datasets.splice(0, 1);
			window.myRadar.update();
		});

		document.getElementById('removeData').addEventListener('click', function() {
			config.data.labels.pop(); // remove the label first

			config.data.datasets.forEach(function(dataset) {
				dataset.data.pop();
			});

			window.myRadar.update();
		});
	</script>
</body>

</html>
